Mac OS CATALINA

Have you Tried Reinstalling the macOS?:

The 10.15.4 update is an add on. So, if it is not installing, you should reinstall the MacOS. All will be updated.

So, Reinstall the MacOS:

Sometimes installed macOS files become manipulated, technically. Reinstalling the macOS will fix these corrupt items.

Nothing would be lost. It’s just that Missing files will be reinstalled, and misplaced files will be placed back to where they should be.

Go Here: How to reinstall macOS from macOS Recovery - Apple Support.

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Always Back Up the Mac Prior:

Create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the reinstall. Use an external drive at least 1.5 times the size in storage capacity.

Are you Concerned of Losing Data?

• If not, just move ahead and erase the disk and then install the macOS
• If so, back up your Mac: (using Time Machine)

Bharathasimha Said:

"Mac OS CATALINA: I'm using MacBook 16 inch I've not yet received 10.15.4 update can anybody help regarding this"

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Go Here: How to update the software on your Mac - Apple Support